Bituminous composition.



srsrrzs CLIFEORD RICHARDSON, OF NEW 'ET ORK, AND CHARLES N. FORREST, OF BROOKLYN, NEW YORK, ASSIGNQRS TO THE BARBER ASPHALT PA VING COMPANY, OF PHILADELPHIA,- PENNSYLVANEA, A CORPORATION OF l YST VIRGINIA.

PETUWHNQUS composition.

Specification of Letters Patent.

Patented May 7, 1907.

To all whom [it may concern:

Be it known that We, CLIFFORD RICHARD- sort, residing in the borough of lvi&11l'l21.iten, in the city, county, and State of ew York, and GHARLES N. FoRREs'r,

residing in the borough of Brooklyn, in the county of and tats of New York, have invented certain new and useful Improvements in Bituminous Compositions, of which the fol lowing is a specification.

The invention relates to an improvement in such compositions as are userl in roofing, Waterproofing, painting, or similar purposes for which native biturnens or their products are employed, involving their exposure to sunlight and to the elements.

The invention is based upon the discovery that native bitumens inc relatively pure stete ere injuriously ailecteal by revs of the sun (especially ectinic and the elements, so that when they are used in the form of a protective coating; for roofs or for structural or other forum of steel or iron Where they are ex osed to sunlight, they are not sufficient vresistant to afford the protection for which they are used. OW We hvve discovered that the presen co in the native bitumens of pure gruphitic curbou in the form of a. flaky powder renders thorn resistant to sunlight and improves their. in other respects. This is because graphite is impei'ietroble to the ectinic rays which. injuriously effect the bitumen.

In practicing our invention, we treat the bitumen, While. in a molten condition, with from .25 'to.5O of the purest for graphite eveilable, such as the fluke graph to produced by the Acheson process, until the componeiits are thoroughly mixed. it

then permitted to cool and in this state is in proper condition for use in me various procto which native bitumcns are applied, and which involves open air exposure, such as the manufacture of roofing materials, paints, protective coatings, and other out of door osphaltic surfaces.

We are aware that it has been proposed to mix lump black with asphalt for the purpose of rendering the some more elastic and. improving its Wearing; properties. But it is i1 :1- possible to incorporate more than 15 7 of lamp black. with. the native bitumens if they are to retain their valuable property of li uefying by best, and this small proportion oes not materially increase the durability of these bitumens when exposed to sunlight and the elements.

Having thus fully described our invention, We claim and desire to secure by IJCt/tOY-S Pattent:-

l. A protective substance which resists the injurious cflccts of the suns rays comp ising a native bitumen in combination with W'i tnesses:

ilicun. l1. PARKER, M. P. Tours. 

